Heating torch



G. L. HAMMON HEATING TORCH A Filed March 22, 1950 NNN /NVf/Vmf. G20/'ge L. hmmvm- Arron/vm:

Patented Dec. 8, 1931 UNITED STATES PATENT OFFICE GEORGE I. EAMMON, Ol' SAN FRANCISCO, CALIFORNIA, ABSIGNOB TO NATIONAL WELD- ING EQUIPMENT COMPANY INCORPORATED, OF BAN FRANCISCO, CALIFORNIA HEATING TORCH Application illed Iarch 22, 1830. Serial No. 488,117.

This invention relates to improvements in heating torches, or blowpipes, and more particularly to the nozzle of the torches of the type in which as and com ressed air are mixed and ignlted to pro uce a heating flame.

To those skilled in this art it is known that the use of natural gas in this type of torch provides a very effective heating iame, but

a diicult has developed, in that, when a large or ong heating flame is required, it tends to blow out, and the object of the invention is to provide means to prevent the flame from blowing out in any variation of 16 the flame from small to large.

Another object is to provide a nozzle with multiple iiames surrounding the end of the nozzle and the heating flame.,

Another object is the construction of a nozzle having an inner igniting iiame adjacent to and surrounding the nozzle tip, and another igniting iiame concentric to the inner flame, whereby a short, or small heating iiame will be kept ignited by the inner ame,

23 and a long or large heating flame will be kept ignited by the outer igniting flame and thus provide for wide variations 1n the heating flame without having it blow out.

Another object of the device is to provide means for supplying the igniting flames with gas mixture from the main stream of the mixture as it blows through the nozzle.

Another object is the provision of means for mixing the gas and air as it enters the nozzle.

Other objects will appear as the description progresses.

An embodiment of the invention is shown in the accompanying drawings in which the same reference numeral is applied to the same portion throughout the several views, and of which there may be modifications.

Figure 1 is a sectional view of the nozzle and gas and air supply head with a portion of the pipes.

Figure 2 is an end view looking from the left of Figure 1.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4 is a section on line 4-4 of Figure 1.

Figure 5 is a section taken on line 5-5 of Figure 6 showing a modied form of the invention.

Figure 6 is a sectional view of a moded form of nozzle.

The numeral 1 indicates the outer shell of a nozzle, and 2 the tip center iece, which has the opening 3 leading to the s ightly enlarged chamber 4.

The tip has the iiange 5 which fits the outer shell tightly. At the feed end of the nozzle is a plug 6 which is secured to the shell by screw threads or other suitable means. This plug has integral therewith, a tubular member 8 projecting forward to the flan e 5 formingan inner annular chamber 9 an the outer annular chamber 10.

The two chambers 9 and 10 are connected by small spaced holes 11 and the chamber 9 is connected to the chamber 4 by a series of small holes 12.

The iange 5 has the annular row of holes 13 communicating with the chamber 9, and the annular row of holes 14 concentric to the row of holes 13 communicates with the chamber 10. The as supply head 15 is connected the nozzle y means of the screw threads The chamber 17 is provided, and in the chamber is the mixer 18 comprising the cylindrical end members 19 and 20 and the connecting member 21, adapted to space the end members to form a mixing chamber 22 between the members.

Compressed air is admitted throu h the port 23 from the supply pipe 24. T is air flows through the holes 25 into the mixing chamber and is met by the gas from the port 26 in the gas supply pipe 27, it being suitably mixed as it passes through the holes 28 into the chamber 4.

In operation the gas and air are turned on in suitable proportions, and are mixed as they pass into the nozzle. The opening 3 being smaller thaan the chamber 4 acts to retard the iiow of the gas mixture, and causes some of it to iiow through the holes 12 into the chamber 9, and out through the holes 13 l to form the inner ignition llame, as indicated by the dotted lines at I, and some of the gas mixture will flow through the holes 11 into the chamber 10 and out through the holes 14 to form the outer ignition flame as indicated by the dotted lines at O, both of the igniting flames im inging on the flow of mixture to the flame The modified forni shown in the Figures 5 and 6 is found to be more efficient in the smaller sizes, that is about half the size, as shown in the drawings.

This form operates on the same principle as the above described form, but in place of the series of annular holes 13 and 14, annular openings 29 and 30 are provided, which openings extend back to form the chambers 31 and 32. The tip opening is indicated at 33, and the enlarged chamber at 34.

Holes 35 by-pass the gas mixture to the chamber 32, and holes 36 from the chamber 32 to the chamber 31.

In this instance the construction comprises two parts, the main body portion 37 and the outer shell 38.

The operation is the same as in the first form, but the ignition flames will be solid annular flames concentric to and impinging on the main flow of gas mixture.

It is obvious that more than two ignition flames may be produced by adding more spaced outside shells.

Having thus described my invention what I desire to secure by Letters Patent of the United States is as follows, but modiications may be had in carrying out the invention as shown in the drawings, and in the above particularly described form thereof within the purview of the annexed claims:

1. A heating torch of the class described comprising a nozzle body having a central opening, means to supply a gas mixture to the central opening, an inner, and an outer chamber surrounding said central opening, means to bypass a portion of the gas mixture to said inner chamber, means to bypass a portion of the gas in the inner chamber to said outer chamber and openings adjacent to the tip of said nozzle leading to said chambers to form a pair of igniting flames surrounding said central opening.

2. A heating torch of the class described comprising a nozzle body having a central opening, means to blow a mixture of gas and air through said opening, a counterbored portion in said central opening, multiple chambers concentric to said central opening, and spaced therefrom, and from each other, openings in said counterbored portion leading to the first said chambers, communicating openings between each of said multiple chambers and its adjacent chamber, openings in annular and concentric relation to said central opening, leading to said multiple chambers adjacent to the tip of said nozzle, whereby an inner and outer i niting flame may be maintained around the tip of said nozzle.

3. A heating torch Aof the class described comprising a tubular body having an opening therethrough, a head having gas and air pipes connected thereto secured to one end of said opening, a counterbore in said opening adjacent to said head, a chamber surrounding said tubular body, and a second chamber surrounding said first chamber, openings connecting the first chamber with the counterbored portion, and openings connecting the first chamber with the second chamber, openings spaced around the tubular body adjacent the tip thereof into the first chamber, and spaced openings concentric to the spaced openings into the first chamber whereby an inner and an outer igniting flame may be maintained while the gas mixture is blowing through the nozzle.

4. A heating torch of the class described comprising means to blow a gas mixture through a central opening in a nozzle body, means to bypass some of the gas mixture to supply an inner igniting flame surrounding the'tip of said nozzle, means to bypass some of the gas mixture supplying said inner flame to supply gas to an outer ignitin flame surrounding the inner flame, and oth flames impinging on the flow of gas mixture from said tip.

5. A blow torch of the class described comprising a nozzle body having an opening therethrough for the flow of a gas mixture, two or more concentric tubular members spaced to form chambers around the nozzle body, said chambers having open ends adjacent the tip end of said nozzle, means to bypass some of the gas mixture blowing through said nozzle to one of said chambers, and from one chamber to another in series whereby a series of concentric and semi-spherical llames impinge on the flow of gas mixture as it blows from the nozzle tip.

6. A blow torch of the class described comprising a nozzle body having a central opening therethrough, a fuel supply head connected to one end of said opening, gas and compressed air ports in said head, a mixer unit having spaced end members, holes through the end members to the central space between the end members, said end member holes communicating with the compressed air port and the central space communicating with the gas port whereby gas and air meeting in the central space will be thoroughly mixed as they flow through the nozzle, annular openings surrounding said nozzle adjacent the tip of said nozzle and communicating with annular chambers around the nozzle body, means to bypass some of the gas mixture to one of said chambers, and means to bypass some of the gas mixture from one chamber to another in succession whereby a series of igniting flames are maintained around the tip end of the nozzle, each flame impinging on the main iow of gas mixture to keep it ignited.

7. A heating torch of the class described comprising a nozzle body head, a central opening in said head, a gas and air supply xture adapted to be connected to one end of said opening, a central tubular member connected to the other end of said opening, a flange on said tubular member and spaced from the outer end thereof, anl intermediate tubular member concentric with, and spaced from said central tubular member, and integral with said body head, whereby a chamber is formed between the central tubular member and the flange, and an outer shell secured to the body head, and adapted to fit over said flange, and spaced from the intermediate tubular member to form an outer chamber concentric with the first chamber, a counterbored portion in the central opening, holes extending from the counterbore to the first chamber, and holes communicating be-y tween the inner and outer chambers, a. series of spaced holes through said flange for each chamber, the tip end of said central member adapted to roject from the end of said outer shell, and t e outer face of said flange.

8. A heating torch of the class described comprising a nozzle in two parts, a body member having a central tubular member, an intermediate tubular member s aced from, and concentric to the central mem er to form an intermediate annular chamber constituting one part of said nozzle, and an outer shell forming the second part of the nozzle, said shell being spaced from, and concentric with said intermediate tubular member to form an outer chamber, a central opening through the body portion, screw threads in one end of said opening, a counterbored portion adjacent the screw threads in said opening, transverse openings from the central opening to the intermediate chamber, and

transverse openings from the intermediate chamber to the outer chamber, the tip end of said central tubular member bein adapted tol project from the faces of the tu ular members.

GEORGE L. HAMMON. 

